I tried that powder in one of my 6.5 Grendels with a 20" proof research barrel because it was supposed to be the velocity king, and even with a very compressed load, and a 100gr. Lapua scenar BTHP, I couldn't even get above 2500 my. The good news is that I never hit pressure. With XBR 2808, I'm getting 2818 mv on a good load, 1/4" groups at 100 yards, with an SD of 1, ES of 3,and can still go higher.